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network: keep track of dead peers in iteratePeersWithSendMsg()

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send() can return errStateMismatch, errGone and errBusy. errGone means the
peer is dead and it won't ever be active again, it doesn't make sense retrying
sends to it. errStateMismatch is technically "not yet ready", but we can't
wait for it either, no one knows how much will it take to complete
handshake. So only errBusy means we can retry.

So keep track of dead peers and adjust tries counting appropriately.
This commit is contained in:
Roman Khimov 2021-08-06 15:25:41 +03:00
parent 80f3ec2312
commit 966a16e80e
1 changed files with 27 additions and 16 deletions
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41
pkg/network/server.go
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@ -1144,12 +1144,15 @@ func (s *Server) requestTx(hashes ...util.Uint256) {
// passed, one is to send the message and the other is to filtrate peers (the
// peer is considered invalid if it returns false).
func (s *Server) iteratePeersWithSendMsg(msg *Message, send func(Peer, bool, []byte) error, peerOK func(Peer) bool) {
var deadN, peerN, sentN int
// Get a copy of s.peers to avoid holding a lock while sending.
peers := s.getPeers(peerOK)
if len(peers) == 0 {
peerN = len(peers)
if peerN == 0 {
return
}
mrand.Shuffle(len(peers), func(i, j int) {
mrand.Shuffle(peerN, func(i, j int) {
peers[i], peers[j] = peers[j], peers[i]
})
pkt, err := msg.Bytes()
@ -1157,39 +1160,47 @@ func (s *Server) iteratePeersWithSendMsg(msg *Message, send func(Peer, bool, []b
return
}
success := make([]bool, len(peers))
okCount := 0
sentCount := 0
// If true, this node isn't counted any more, either it's dead or we
// have already sent an Inv to it.
finished := make([]bool, peerN)
for i, peer := range peers {
okCount++
if err := send(peer, false, pkt); err != nil {
continue
}
err := send(peer, false, pkt)
switch err {
case nil:
if msg.Command == CMDGetAddr {
peer.AddGetAddrSent()
}
success[i] = true
sentCount++
sentN++
case errBusy:
continue
default:
deadN++
}
finished[i] = true
}
// Send to at least 2/3 of good peers.
if 3*sentCount >= 2*okCount {
if 3*sentN >= 2*(peerN-deadN) {
return
}
// Perform blocking send now.
for i, peer := range peers {
if success[i] {
if finished[i] {
continue
}
if err := send(peer, true, pkt); err != nil {
if err != errBusy {
deadN++
}
continue
}
if msg.Command == CMDGetAddr {
peer.AddGetAddrSent()
}
sentCount++
if 3*sentCount >= 2*okCount {
sentN++
if 3*sentN >= 2*(peerN-deadN) {
return
}
}